A key radical intermediate in the Grignard reaction, a textbook reaction in organic synthesis, has been trapped and studied for the first time (Angew. Chem. Int. Ed.2008, 47, 9118). The organomagnesium Grignard reagent generally reacts with a carbonyl compound to form an alcohol. Normally it acts as a nucleophile, but sometimes a radical mechanism is involved. Despite the reaction's broad use, researchers have never observed the presumed intermediate along the radical pathway, a magnesium . . .